Flourish raises $500 million for brain-inspired AI models

The round

Flourish, a startup developing AI models inspired by how the human brain works, raised $500 million in initial funding, closed around June 4, 2026, reaching a $2.5 billion valuation. The round included a personal check from Jeff Bezos, alongside funds such as Lux Capital, GV and Catalio Capital.

Who's behind it

The company was founded by Thomas Reardon — creator of the Internet Explorer browser at Microsoft in the 1990s and co-founder of CTRL-labs, a neural interface startup acquired by Meta in 2019 — and Rob Williams, a former member of Amazon's S-team.

A different bet

While most of the market keeps investing in ever-larger transformer architectures, Flourish is betting on computational neuroscience approaches (connectomics) with its system called Cortex AI, targeting an energy draw close to that of the human brain — a thesis still largely unproven at scale, but one that attracted a meaningful check.

Why it matters

The round is a sign that part of AI venture capital is also being directed toward research on alternative architectures, not just toward scaling existing models.